Artificial tooth.



1 all whom it may concern:

Be it known that I, JOSEPH RAMSPERGER, a citizen f Switzerland, residingat York,- in the county of ork, State of Pennsylvania, have inventedcertain ew and useful Improvements in Artificialleeth; a nd I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will to make and use the same.

This invention relates to improvements in artificial teeth andparticularly with respect to the means for retaining the securing dowelpins to the teeth and this application is a divisional application ofthe original application of Joseph Ramsperger, filed November 1,

for the article and no claim is made herein to the process, as will beobserved by a reading of the claims, the process. forming the subjectmatter of the said original application.

It has been found in practice that a dowel pin cannot be made to stay inan ordinary straight hole for [it is made sufficiently close to insureagainst the pin pulling out, then there is dangerof cracking the toothin forcing the pin into place. Various methods have been proposed forsecuring the pins by soldering them to plates baked into the teeth, butsuch plates must be of platinum because of the necessity ofrefractorin'ess and prevention of discoloration of the teeth. Platinumplates are expensive and in a factory Where millions of teeth aremanufactured in a year, the aggregate expense is enormous. It has beenfound that the best method for holding the pins in the teeth is toenlarge the inner end of the holes or recesses that receive the pins andthen provide 'the pins with heads that fill the enlargements. It isdesirable that the heads of -material and of the operation. It is foundin practice, however, that asimple inwardly enlarged cavity in aporcelain tooth cannot be filled with solder as a head for a pin for thereason that the solder when melted, instead of flowing into closecontact with the wall of .the enlargement, clings to the pin and followsalong it outwardly of the recess. It has been proposed to line therecess and its enlargement withan inwardly ex-. panded platinum tube,but both the matei'ial and the process are expensive. Such a lining hasfor its object to provide a metal surface to which the-solder will clingso that the enlargement may be filled with solder.

The object of the present invention is to provide an artificial toothwherein the enlarged recess will be pro Specification of Letters Patent.

- enable others skilled in the art to which it appertains 1905, Seriall\o. 285,417. The present application is the reason that the friction isnot sufficient and if the the pins be of solder because of the cheapnessof the J UNITED STATES PATENT oFFIon.

JOSEPH RAMSPERGER, OF YORK, PENNSYLVANIA.

ARTIFICIAL TOOTH.

Patented July 2, 1907.

Application filed February 12,1906. $erial No. 300,654.

vided with particles of metal to which the melted sold er will flow andcling and by which it will be held within the enlargement of the cavityto completely fill the cavity while uniting with the pin to hold thelatter immovable. This is accomplished by embedding in or impregnatingthe wall of the cavity with metallic particles, preferably platinum,during the process of baking the teeth.

In the drawings, Figure l is a longitudinal section through a toothembodying the said invention. Fig. 2 is a transverse section. Fig. 3 isa longitudinal section through the tooth and the mold in the process offormation of the tooth.

Referring now to the drawings, 1 designates a common form of mold and 2the cores by which the recesses or cavities are formed in the tooth.Each core is provided with a core pin 3 and upon each core pin isdiposed a collar or head 4 of paper or other combustible material andthis collar or head is provided with a covering or coating of platinumparticles. The porcelain or other material is then placed in the moldand the whole is subjected to the initial baking process, the core pinswith their heads or collars resulting in the formation of inwardlyenlarged recesses 7 as illustrated in Fig. 2 of the drawings and thereduced or outer end portions of which recesses are indicated at 6.

When. the porcelain is placed in the mold around the I core pins andtheir heads, the platinum dust upon the heads is embedded in the wallsof the enlarged portions of the recesses, and in the final bakingprocess, during which the core collars are burned out, these platinumparticles are permanently fixed in position. When the attaching pins areto be secured. in the teeth, a small cylindrical block of solder S isdropped into each recess, the dowel pins 9 are then placed in therecesses and the tooth is subjected to heat-suflicient to melt theblocks of solder which when melted. completely fill the enlargements ofthe recesses and unite with the metal particles which insure against thesolder following out along the pins. The solder at the same time uniteswith the inner ends of the pins 9, combining the pins, the solder andthe platinum dust into one solid mass so that the pins are held againstwithdrawal.

What is claimed is:-

1. As an article of manufacture, an artificial tooth having a cavitytherein, finely divided particles of metal embedded in the wall of thecavity and partly exposed Within the cavity, and a pin inserted in saidcavity and united to said finely divided particles by solder.

2. As an article of manufacture, an artificial tooth having an inwardlyenlarged cavity therein, finely divided particles of metal embedded inthe wall of the cavity and partly exposed within the cavity, and a pininserted in cavity having particles of finely divided metal embcdd saidcavity and united to said finely divided particles by therein and partlyexposed within the cavity. solder. In testimony whereof, I aflix mysignature, in preseu 3. As an article of manufacture, an artificialtooth of two witnesses. having a pin-receiving socket therein, the wallof which JOSEPH RAMSPERGER socket has secured thereto finely dividedparticles of metal that will take solder. Witnesses:

4. As an article of manufacture, an artificial tooth A. J. BRENNEMAN,having a pin receiving cavity therein, the Wall of said GRACE M. DRAYER.

